I have bought a 40inch led tv of VU nd also set a HD SET-UP BOX through asianet cable vision. the problem noted is in certain channels an one inch gap line is seen on the top of the screen and i have reported it to the company and send them the picture nd they finally replaced the tV. but the problem continued with the new set also. but later it is found the mentioned problem arises only when using HD CABLES and not when using AV cables, any solutions please. THE MODEL IS VU LED-40K16, FULL HD, 1080 PROGRESSIVE SCANNING